If you believe your child has an allergy, you need to seek medical attention from a pediatrician or an allergist. There are many tests available to pinpoint allergens, but not all are successful. Although, most allergists still believe the skin tests are the most accurate, they do not pinpoint delayed food reactions. The same happens with allergy blood tests, they are great for some people but not for others. Your pediatrician or allergist however may be able to pinpoint the allergen with an elimination diet, in the case of food allergies.